It could be the service pack of your computer's operating system. You may need a later version. When connecting your n73 to the computer, select "Pc suite" on your phone. Try any or both of these. Preferably use the 2nd solution first.

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Hi,
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It means the application installer not compatible with your phone. i.e. the application file is .sisx for Symbian S60v3 which is not compatible with your device. Or the file is broken or outdated.

When you download any application software, make sure its compatible with your phone. Your device can only install JAVA application so you can download application with .jar extension. And choose application with proper size for your screen (128x160 pixels), if its too big, it wouldn't able to be installed too.

TO update the phone software you can contact the your mobile care authentic units or one the mobile you go to settings ->phone mgmt->options->software update.
NOTE:you may require internet connectionand data charges may apply

you can get updates and installations for your phone software here, they automatically load the drivers when you connect the phone to a usb port via the cable.
http://direct.motorola.com/ENG/SoftwareUpdateSummary.asp?country=GBR&language=ENG&web_page_name=SUPPORT&strCarrierId=&strPhone=RAZR%20V3&strCable=Mini%20USB%20Data%20Cable